Patent · US Expired

Process for producing aliphatic oligocarbonate diols

US7112693B2 · kind B2 · utility

5Cited by

11References

29Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Jörg Tillack · Bensberg, DE
Jörg Laue · Olfen, DE
Herbert Witossek · Leipzig, DE
Andreas Schlemenat · Neuss, DE

Key dates

Filing date	Dec 12, 2003
Grant date	Sep 26, 2006
Priority date	—
Expiry date	Nov 27, 2024

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G64/305
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The present invention relates to a process for producing an aliphatic oligocarbonate diol comprising a) reacting an aliphatic diol with dimethyl carbonate at an elevated pressure in a reaction mixture, and b) subsequently removing unreacted methanol and dimethyl carbonate under a reduced pressure to uncap the terminal OH groups.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.